>>76743053 (OP)
>No progress
>4 years
Probably nearly everything except what you've been doing to not be fat. Nice work not being fat but most people at least come across some modicum of success incidentally just by being into fitness and sticking with it for a solid period. If you've noticed nothing for years like you're saying, probably time for a complete overhaul.
Hard to say what you're doing wrong or right when you haven't posted it, though.